[OS X TeX] dots in Texshop

[Alain Matthes]

Hello

i've a problem with this little example :

grid.tex

\documentclass[a4paper,12pt]{article}
\usepackage{pstricks}

\begin{document}
\psset{unit=1cm}
\begin{pspicture}(-4,-4)(4,6)
\psgrid[subgriddiv=1,griddots=5,gridlabels=0pt](0,0)(-4,-4)(4,6)
\rput(-0.3,-0.3){$O$}
\psline[linewidth=1pt]{->}(0,0)(1,0)
\rput(1,-0.3){$\vec{i}$}
\rput(-0.3,0.7){$\vec{j}$}
\psline[linewidth=1pt]{->}(0,0)(0,1)
\psline[linewidth=1pt]{-}(-4,0)(4,0)
\psline[linewidth=1pt]{-}(0,-4)(0,6)
\end{pspicture}
\end{document}

composition -> (atex + tex-Ghostscript)

a) With TexShop, Texniscope et Aperçu i need 500% 520% zoom to see the
dots, (with Texniscope  and  aperçu I used grid.pdf )



with acrobat reader 7 no problem with grid.pdf at any size of zoom and
no problem with the printer

b) With the file grid.ps, i see the dots with aperçu at any size but
only with 520% with Texshop.

What is the problem  ?

Thanks Alain Matthes
  
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